it’s a tray filled with fucking tubby custard that they jam up to the roof of your mouth and keep there. then they take it out and use the indents of your teeth to make retainers and stuff. it wouldn’t be that bad if it didn’t stay there that long, if the shit wasn’t flavored (’would u like bubblegum or cookie dough’ ‘i don’t really care they both taste like smoking rubber’), and if the ortho didn’t ALWAYS OVERFILL IT SO YOU END UP SWALLOWING LIKE A QUARTER OF THE STUFF AND GAGGING BECAUSE YOU’RE LITERALLY DEEP THROATING A PLASTIC TRAY AND THIS FUCKIN. PUDDING TEETH GLUE